Dorhynchus rostratus ( Sakai, 1932 )

Arzivian, Arteen, Alrubaie, Ahmad, Yang, Jessica, Lin, Huiyu, Zhang, Eva & Leong, Rupert, 2022, Crabs (Crustacea, Decapoda) from the Seas of East and Southeast Asia Collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 4. South China Sea, Bulletin of the National Museum of Nature and Science. Series A, Zoology 48 (4), pp. 147-191 : 155

Dorhynchus rostratus ( Sakai, 1932)

( Fig. 3A )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 54, 1 8 (CB 6.6×PCL 8.5 mm), NSMT-Cr 30908.

Remarks. A fully-grown female at hand generally agrees with the original description ( Sakai 1932, as Achaeopsis ), though the protogastric and epibranchial spines ( Fig. 3A ) are not prominent as in the figures represented by Sakai (1932, fig. 3; 1938, fig. 17) and also in the female from the Timor Sea ( Takeda et al. 2022a, fig. 5C–D). The carapace tuberculation of the present specimen is more distinct than the Timor Sea specimen.

Distribution. This species was previously known from Japan, the Kai Islands , and the Timor Sea, 170–650 m in depth. This is a new record from the South China Sea. The present bathymetric record, 777 m in the South China Sea, is the deepest known for this species.

Figures

Fig. 3. A: Dorhynchus rostratus (Sakai), 8 (NSMT-Cr 30908; CB 6.6×PCL 8.5mm) from sta. 54. B: Oncino- pus angustifrons Takeda and Miyake, Ə (NSMT-Cr 30909; CB 3.4×PCL 4.3mm) from sta. 48. C–E: Oxypleurodon sphaenocarcinoides (Rathbun), ovig.8 (NSMT-Cr 30913; CB 7.8×PCL 12.7mm) (C–D) from sta. 54; 8(NSMT-Cr 30914; 5.0×8.3mm) (E) from sta. 54.